Preheat oven to 350 degrees.Cream 1/2 stick plus 1 tablespoon butter with cinnamon andsugar. Add egg and mix until combined. Add vanilla and mix.Then add flour, baking powder, and salt to the mix.Add flour mixture and milk alternately until totally incorporated.Do not over beat. Stir in blueberries. Grease a 9 x 13 inchbaking pan. Pour in batter.In a separate bowl, combine topping ingredients andcut together using two knives or a pastry cutter.Sprinkle over the top of the cake. Bake cake for 40 to 45 minutes,or until golden brown.